WO2018230258A1

WO2018230258A1 - Multi-phase claw pole motor

Info

Publication number: WO2018230258A1
Application number: PCT/JP2018/019315
Authority: WO
Inventors: 勇新田
Original assignee: 日本精工株式会社
Priority date: 2017-06-15
Filing date: 2018-05-18
Publication date: 2018-12-20
Also published as: JP6465330B1; JPWO2018230258A1; US20200099262A1

Abstract

A multi-phase claw pole motor comprises: a plurality of claw portions (31) having magnetic pole surfaces (31a) facing a rotor (10); and radial direction yoke portions (32) extending from the claw portions (31) to the contour side. The multi-phase claw pole motor is provided with: claw magnetic poles (30) laminated in the shaft direction to form a stator inner circumferential portion (3); annular coils (4) each disposed in the space between the radial direction yoke portions (32) of adjacent claw magnetic poles (30); and outer circumferential yokes (50) disposed outside the stator inner circumferential portion (3) in the circumferential direction to form a stator outer circumferential portion (5). The claw magnetic poles (30) are formed of a magnetic compact formed by electrically insulating and compressing the surface of magnetic powder, and the outer circumferential yokes (50) are formed of soft magnetic laminated sheets. The multi-phase claw pole motor is also provided with a first positioning means (7) for positioning each of the outer circumferential yokes (50) at a predetermined position.

Description

Multiphase claw pole motor

The present invention relates to a multiphase claw pole motor.

Conventionally, as a multi-phase claw pole type motor, as shown in FIG. 25, a claw portion 110 of a claw magnetic pole (first claw magnetic pole 109A, second claw magnetic pole 109B), a radial yoke portion (in the radial direction of the yoke) (Extended portion) 111, outer yoke (portion of the yoke located on the motor outer periphery) 112 is formed of a dust core, and an annular coil is sandwiched in the axial direction (for example, known) Patent Document 1). According to the motor having such a configuration, the magnetic path cross-sectional area can be made higher than the claw portion of the bent iron plate.

Generally, a dust core has an advantage of having a three-dimensional non-directional magnetic characteristic. Therefore, it is advantageous in terms of magnetic properties to use a dust core for a claw part that desirably has a three-dimensional spread and a radial yoke part in the vicinity of the claw part.

Also disclosed is a multi-phase claw pole motor formed by a circumferential ring-shaped laminated core made of a soft magnetic magnetic plate having claws laminated in the axial direction (see, for example, Patent Document 2). In Patent Document 2, although the claws are connected to each other, a hole corresponding to the gap is opened to increase the magnetic resistance, thereby forming a pseudo claw portion.

However, since the multiphase claw pole motor as in Patent Document 1 is expensive and uses a dust core inferior in magnetic properties as a magnetic path material other than the air gap, the amount of interlinkage magnetic flux is small and the material cost is low. It was high.

In addition, in a multiphase claw pole motor such as that disclosed in Patent Document 2, when an alternating magnetic flux is passed in the laminating direction even in the case of electrical steel sheets, the insulation layer becomes parallel to the eddy current path, so that the current is not disturbed and the iron loss is large (The eddy current increases) becomes a problem.

In order to solve these problems, the inventors of the present application have come up with a multi-phase claw pole motor having a new configuration. That is, for example, a part of the radial yoke and the outer yoke are formed by a core made of a non-oriented electrical steel sheet laminated in the tangential direction (circumferential direction), and the annular coil is axially and radially formed by this laminated core. It is formed so as to wrap in both directions.

Japanese Patent No. 4878183 JP 2014-233189 A

However, in the case of the configuration as described above, the number of parts of the outer yoke is increased, and the assembly may be complicated.

Accordingly, the present invention provides a multi-phase claw pole motor in which the claw portion is formed of a dust core, has a low magnetic resistance and low eddy current loss, and suppresses complicated assembly. The purpose is to do.

The multi-phase claw pole motor according to one aspect of the present invention is
A plurality of claw magnetic poles comprising a plurality of claw portions having a magnetic pole surface extending in the axial direction and facing the rotor with a minute interval, and a radial yoke portion extending from the claw portion to the outer shape side, The claw poles of the claw magnetic poles adjacent to each other are alternately arranged in the circumferential direction, and the radial yoke parts of the claw magnetic poles adjacent to each other are axially opposed to each other. Claw magnetic poles forming the inner periphery of the stator,
Annular coils arranged in the respective gaps of the radial yoke portions of adjacent claw magnetic poles,
A plurality of outer yokes arranged in the circumferential direction on the outer side of the inner periphery of the stator to form the outer periphery of the stator;
The claw magnetic pole is formed of a magnetic molded body that is electrically insulated from the surface of the magnetic powder and compressed, and the outer yoke is formed of a soft magnetic laminate.
First positioning means for positioning each of the outer yokes at a predetermined position is further provided.

According to this aspect, high power, low loss, and low material cost can be realized by configuring the outer peripheral side yoke and the adjacent radial yoke portion with a core laminated in a tangential direction by a non-oriented electrical steel sheet. sell. In other words, when a dust core is used as the magnetic path material, the magnetic flux density is relatively low, and it is not possible to manufacture with a dust core to the outer yoke on the outer periphery of the coil and the radial yoke in the vicinity thereof. Using a dust core that is inferior in magnetic susceptibility and inferior in iron loss in the low frequency range may have led to low output, high loss, and high material cost. , Formed with a core made of non-oriented electrical steel sheets with outer yokes laminated in the tangential direction, and an annular coil formed so as to wrap in the axial direction and radial direction, enabling high output, low loss, and low material cost Yes.

In addition, according to this aspect, each of the outer yokes can be positioned at a predetermined position by the first positioning means. For this reason, even if there are many parts of an outer periphery yoke, it can suppress that the assembly becomes complicated.

The multi-phase claw pole motor of the above aspect may further include second positioning means for positioning each of the claw magnetic poles at a predetermined position.

In the multi-phase claw pole motor of the above aspect, the second positioning means is an inclusion located in a claw-shaped gap of at least a part of the claw magnetic pole, and the inclusion is each of the claw portions opposed in the axial direction. It may be set as the structure which positions by contacting.

In the multi-phase claw pole motor of the above aspect, the inclusion may be nonmagnetic and insulating.

In the multiphase claw pole motor of the above aspect, the inclusion may be an insert molded product in which a magnetic molded body is inserted.

In the multi-phase claw pole motor of the above aspect, the annular coil may be a coil formed by alpha winding, and the inclusion may be an insert molded product in which the annular coil is inserted together.

In the multi-phase claw pole motor of the above aspect, the annular coil may be constituted by a winding wound around an insert molded product.

In the multiphase claw pole motor of the above aspect, the inclusion may have a structure in which the magnetic forming body of another layer is positioned in a state where adjacent inclusions are in contact with each other.

In the multi-phase claw pole motor of the above aspect, the first positioning means is in a shape that contacts the outer periphery and the circumferential end surfaces of the plurality of outer yokes to form a part of an annular shape, A structure in which the first positioning means are combined with each other to form an annular shape may be used.

In the multi-phase claw pole motor of the above aspect, the plurality of first positioning means are configured to sandwich the magnetic molded body positioned by the second positioning means in the vicinity of the center in a state where they are combined with each other. May be.

In the multi-phase claw pole motor according to the above aspect, the plurality of first positioning means have a shape in which approximately half of the plurality of outer yokes are positioned and arranged in a semi-annular shape, and the first pair is combined. The positioning means may be configured to sandwich the magnetic molded body positioned by the second positioning means.

In the multiphase claw pole motor of the above aspect, a groove portion may be formed in the circumferential combination portion of the first positioning means, and the coil lead wire of the annular coil may be drawn out through the groove portion.

In the multiphase claw pole motor of the above aspect, the first positioning means may be a component of a bearing support structure that supports the bearing.

In the multiphase claw pole motor of the above aspect, the surface of the claw magnetic pole that contacts the outer periphery yoke has a constricted shape such as a taper or a step so as to bite in the inner peripheral direction toward the extending direction of the claw portion. Also good.

According to the present invention, there is provided a multi-phase claw pole motor in which the claw portion is formed of a dust core, has a low magnetic resistance and a small eddy current loss, and suppresses complicated assembly. can do.

It is a perspective view of the stator inner peripheral part constituted by superposing three pairs of claw magnetic poles in total. FIG. 2 is a perspective view showing a state in which one outer yoke is abutted and brought into close contact with the inner circumference of the stator shown in FIG. 1. It is a perspective view which shows the stator of the state by which all the outer periphery yokes are arrange | positioned around the stator inner peripheral part, and the winding terminal of the annular coil was pulled out. It is a figure which shows one structure of a pair of claw magnetic pole in 1st Embodiment of this invention. It is a figure which shows the other structure of a pair of claw magnetic pole in 1st Embodiment of this invention. It is a front view of a multiphase claw pole motor. It is a figure which shows the structure of the cross section in the VII-VII line of FIG. It is a front view of the annular coil formed by alpha winding. It is a side view of the annular coil formed by alpha winding. It is a perspective view of the annular coil formed by alpha winding. It is a perspective view which expands and shows the surrounding structure of both ends of the coil | winding of the cyclic | annular coil formed by alpha winding. It is a perspective view which removes one outer yoke part so that the inside can be seen, in a state where three annular coils formed by alpha winding are sequentially shifted in the circumferential direction. It is a disassembled perspective view of a pair of claw magnetic poles and an annular coil. It is a perspective view which shows the stator inner peripheral part and outer peripheral yoke of the state which removed the inclusion. It is a perspective view which shows the stator inner peripheral part and outer peripheral yoke of the state which removed the inclusion. An example of a stator inner peripheral portion in which an engaging portion is formed on the outer yoke and an engaged portion that engages with the engaging portion is formed on the outer periphery of the claw magnetic pole, an outer yoke, and an example of an annular coil are shown. It is a perspective view. It is a perspective view which shows the stator inner peripheral part and outer periphery yoke of the state which removed the annular coil from FIG. It is a perspective view which shows a stator inner peripheral part and a pair of semi-annular thing before matching. It is a perspective view which shows a stator inner peripheral part and a pair of semi-annular thing after abutting on the outer periphery. It is a disassembled perspective view of an annular coil, an inclusion, and a pair of claw magnetic poles. It is a perspective view of the stator inner peripheral part for one phase formed combining an annular coil, an inclusion, and a pair of claw magnetic poles. It is a disassembled perspective view of the multiphase claw pole motor containing a semi-annular thing. It is a perspective view of the multiphase claw pole motor containing a semi-annular thing. It is a figure which shows the assembly procedure of a multiphase claw pole motor. It is a figure which shows the structural example of the conventional multiphase claw pole motor.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The multi-phase claw pole motor 1 of this embodiment includes a stator (stator yoke) 2, an annular coil 4, a shaft 11, and the like. The stator 2 includes a stator inner peripheral portion 3 constituted by claw magnetic poles 30 and a stator outer peripheral portion 5 constituted by an outer yoke 50. The claw magnetic pole 30 is formed of a molded body obtained by electrically insulating and compressing the surface of the magnetic powder, and the outer yoke 50 is formed of a soft magnetic laminated plate (see FIG. 22).

[First Embodiment]
In the multiphase claw pole motor 1 of the present embodiment, the claw magnetic pole 30 has a claw portion 31, a magnetic pole surface 31a, and a radial yoke portion 32 (see FIGS. 1, 4, 5, etc.).

The nail | claw part 31 is extended in the axial direction (pointing the direction of the rotating shaft of the shaft 11), and forms a claw pole. The claw portion 31 is formed with a magnetic pole surface 31 a that faces the outer peripheral surface of the rotor core that rotates together with the shaft 11 with a predetermined minute interval. A plurality of claw portions 31 are formed in a single claw magnetic pole 30 (eight as an example) (see FIGS. 1 and 4). Further, the radial yoke portion 32 is an annular portion that extends from the claw portion 31 to the outer side (outer peripheral side) of the claw magnetic pole 30.

The plurality of claw portions 31 and radial yoke portions 32 are formed by a compact (a dust core) in which the surface of the magnetic powder is electrically insulated and compressed in order to enlarge the magnetic path cross-sectional area in the multiphase claw pole motor 1. Is formed.

In the multiphase claw pole motor 1 of the present embodiment, the stator outer peripheral portion 5 is constituted by a plurality of outer yokes 50. The plurality of outer yokes 50 are arranged at equal intervals in the circumferential direction outside the stator inner periphery 3 (see FIG. 3).

When each outer yoke 50 is disposed outside the stator inner periphery 3, a part (projection 50a) thereof is radially inward so as to form a groove (recess) 50b in which the annular coil 4 is accommodated. This is an extended shape (see FIG. 2). The portion extending in the radial direction is overlapped with the annular coil 4 in a state of being accommodated in the groove (recess) 50b (see FIG. 3).

Further, the outer yoke 50 preferably extends in the axial direction and has a shape in contact with the plurality of claw magnetic poles 30. In the present embodiment, an outer yoke 50 having a comb-like shape or a ridge shape including four projecting portions 50a and three groove portions 50b is employed (see FIG. 2). The outer yoke 50 corresponds to the length in the axial direction when the claw magnetic poles 30 for one phase are overlapped for three phases by three pairs of two opposing pairs (see FIG. 2). Thus, by making the outer yoke 50 common to the claw magnetic poles 30 of a plurality of phases (in this embodiment, three phases), it is possible to reduce the number of parts and simplify the structure and assembly. .

The outer yoke 50 is composed of a laminated core in which a plurality of thin electromagnetic steel plates 51 shaped like comb teeth or scissors are stacked one on top of the other (see the portion indicated by the round frame in FIG. 2). Of the conventional stator yoke formed integrally with the dust core, a part of the portion constituting the radial yoke portion (in the configuration of the present embodiment, the radial direction is more than the claw magnetic pole 30). The outer portion, that is, the portion of the protruding portion 50a) and the portion constituting the outer yoke, in other words, the portion excluding the vicinity of the claw shape, in this embodiment, crosses the non-oriented electrical steel sheet 51. The multi-phase claw pole motor 1 having a high output, low loss, and low material cost is realized with a core laminated in the tangential direction on the surface.

That is, in the present embodiment, the interlinkage magnetic flux can be effectively increased among the claw magnetic poles 109A of the cited document 1 formed of a dust core that is inferior in magnetic characteristics and easily leads to low output, high loss, and high material cost. By forming the portion with a core made of the non-oriented electrical steel sheet 51, it is possible to realize the multiphase claw pole motor 1 that achieves both high output and cost.

On the other hand, it is preferable that the outer periphery of the claw magnetic pole 30 is a polygon in which a surface in contact with the outer yoke 50 is a flat surface. In the outer yoke 50 composed of the laminated core of the electromagnetic steel plates 51 as described above, when the inner peripheral surface is a curved surface such as a cylindrical outer peripheral surface, the electromagnetic steel plates 51 are structured so that a step (displacement) is generated one by one. Inevitably, it becomes difficult to closely contact the outer peripheral surface of the claw magnetic pole 30 with no gap. In this regard, if the surface in contact with the outer yoke 50 is a flat surface, the inner circumferential surface of the outer yoke 50 can be brought into close contact with no gap.

Thus, when the outer periphery of the claw magnetic pole 30 is a polygon, if the number of phases of the multiphase claw pole motor 1 is 3, the outer periphery of the claw magnetic pole 30 is formed as a polygon having three times the number of sides of the claw portion 31. It is preferable to do. As an example, in the present embodiment, the claw magnetic pole 30 having the number of claw portions 31 of 8 and the outer periphery being a regular 24-gonal shape is a claw in which the radially outer (back side) portion of the claw portion 31 is a flat portion 33f including a side. Two types of magnetic pole 30A (see FIG. 4) and claw magnetic pole 30B (see FIG. 5) in which the radially outer portion of the claw portion 31 is a corner portion (between the flat portion 33f and the flat portion 33f) 33c are adopted. These claw

magnetic poles

30A and 30B are paired and opposed to each other with a shift of 22.5 ° in the circumferential direction to form one phase, and a total of three pairs are formed by sequentially shifting by an electrical angle of 120 ° or a mechanical angle of 15 °. A claw magnetic pole 30 corresponding to the phase is formed. In such a case, the protrusion 50a of the outer yoke 50 having a structure common to the three-phase claw magnetic poles 30 can be abutted against and closely adhered to any of the claw magnetic poles 30 on the outer peripheral flat portion 33f. (See FIGS. 2 and 3).

The annular coil 4 is disposed outside the claw magnetic pole 30 and inside the outer yoke 50. In the multiphase claw pole motor 1 of the present embodiment, three annular coils 4 are arranged at equal intervals in the axial direction corresponding to the pairs of claw magnetic poles 30 of each phase (see FIG. 3). Each annular coil 4 is sandwiched between the claw magnetic pole 30 and the outer yoke 50 in the radial direction while being sandwiched between the protrusions 50a in the axial direction.

A total of 24 outer yokes 50 are arranged in the circumferential direction around the stator inner periphery 3, and the terminal 42 of the winding 41 of the annular coil 4 is connected to the outer yoke 50 and the outer yoke 50. It will be in the state pulled out from the clearance gap 56 between them, and the stator 2 will be formed (refer FIG. 3). The gap through which the winding 41 is drawn is vacant so as to extend in the axial direction.

Here, the multiphase claw pole motor 1 including the stator 2 configured as described above is shown in FIG. 6, FIG. 7, FIG. Moreover, the name of the structure which attached | subjected the code | symbol is as follows. That is, reference numeral 10 denotes a rotor, 12 a bearing, 13 a rotor core, 14 a permanent magnet, 15 a sensor magnet, 16 a front bracket, 17 a back bracket, 18 a sensor, and 19 a resin mold. Reference numeral 6 denotes an inclusion interposed between the pair of claw magnetic poles 30 and claw magnetic poles 30.

As described so far, in each of the above embodiments, a part of the radial yoke portion in the conventional claw pole formed with the dust core (in the configuration of this embodiment, the diameter is larger than the claw magnetic pole 30). The outer portion in the direction, that is, the portion of the protruding portion 50a) and the yoke portion on the outer peripheral side are formed of a laminated core made of a non-oriented electrical steel sheet 51 laminated in the tangential direction, and the annular coil 4 is formed in the axial direction. The multi-phase claw pole motor 1 with high output, low loss, and low material cost is realized because the structure is wrapped in the radial direction.

In addition, since the side surfaces serving as the magnetic flux inflow and outflow surfaces of the outer yoke 50 made of the laminated core are substantially linear in the laminating direction, in each of the embodiments described above, the linear shape of the outer circumference of the claw magnetic pole 30 is concerned. The portion in contact with the surface (powder core surface) is a sectioned flat portion 33f, and the claw magnetic pole 30 is generally polygonal as a whole, so that the outer yoke 50 and the claw magnetic pole 30 are abutted without gaps. It is possible to adhere.

[Second Embodiment]
In the present embodiment, an annular coil 4 formed by alpha winding is employed (see FIGS. 8 to 11). In the annular coil 4 formed by alpha winding, the copper wire is wound in a spiral shape in the innermost circumference, and in the other direction in two layers in the direction of the winding axis, respectively in a reverse spiral shape. The terminal 42 is located on the outermost periphery (see FIG. 10, FIG. 11, etc.). Further, a rectangular wire is used for the winding 41, which makes it difficult to form a gap between the adjacent windings 41, and improves the winding density of the winding 41.

According to the annular coil 4 formed by the alpha winding, since both ends 42 of the winding 41 are pulled out from the outside of the annular coil 4, a space for avoiding the end is not necessary, the magnetic circuit cross-sectional area is increased, and the winding process is performed. Can be simplified.

Alpha winding is, for example, a method in which one winding on the inner circumference of the winding 41 is spiral, the other is wound in a reverse spiral shape, and is fixed by heating after air core winding (self-bonding rectangular wire). Alpha volume) and the like.

For example, in the case of a three-phase multi-phase claw pole motor 1 as in the present embodiment, three annular coils 4 formed by alpha winding may be provided in a state of being sequentially shifted in the circumferential direction.

In addition, the winding 41 in the present embodiment is a flat wire having a cross-sectional side length different from each other and is wound with the cross-sectional longitudinal direction facing the axial direction. In general, the lead wire of the coil needs to be pulled out to the outer periphery so as to pass through the gap between the outer yokes, but the outer yoke needs to increase the magnetic path cross-sectional area as much as possible to reduce the magnetic resistance. The gap between the outer yokes is preferably narrow. Under such circumstances, in the present embodiment, a flat-wise and α-wound annular coil 4 with the longitudinal direction of the cross section oriented in the axial direction is used, and the lead wire (winding 41) of the coil is aligned in the axial direction. (See FIG. 10, FIG. 11, etc.), the outer circumferential joint is narrow in the tangential direction (in other words, the circumferential gap of the notch 34a of the outer yoke portion 34 of the claw pole 30 is narrow). Since the iron gap can be passed and the winding cross-sectional area can be secured, a coil with low copper loss as a whole can be provided.

[Third Embodiment]
The multiphase claw pole motor 1 of this embodiment includes a claw magnetic pole 30 formed of a magnetic molded body obtained by compressing magnetic powder. The claw magnetic pole 30 has a plurality of claw portions 31, a plurality of claw portions 31 having a magnetic pole surface 31 a extending in the axial direction and facing the rotor 10 with a minute interval, and a diameter extending from the claw portion 31 to the outer side. It consists of the direction yoke part 32 and the outer periphery yoke part 34 extended in an axial direction (refer FIG. 12, FIG. 13). A plurality of claw magnetic poles 30 are in a state where the claw portions 31 of the claw magnetic poles 30 adjacent to each other are alternately arranged in the circumferential direction, and the radial yoke portions 32 of the claw magnetic poles 30 adjacent to each other are axially arranged. The stator 2 is formed by being laminated in the axial direction.

The outer yoke portion 34 of the claw magnetic pole 30 is formed with a notch 34a for drawing out the winding 41 of the annular coil 4 to the outer peripheral side. The notches 34a face each other with the radial yoke portions 32 of the adjacent pair of claw poles 30 facing each other in the axial direction, and lead-out holes corresponding to the size of the windings 41 are formed. (See FIGS. 12 and 13).

As in the above embodiment, the annular coil 4 is formed with an alpha winding, and is disposed in each gap between the radial yoke portions 32 of the adjacent claw magnetic poles 30. A rectangular wire is used for the winding 41, and a pair of cutouts 34a are drawn out to the outer peripheral side from a lead hole formed facing each other (see FIGS. 12 and 13).

For example, in the case of a three-phase multi-phase claw pole motor 1 as in the present embodiment, three annular coils 4 formed by alpha winding are sequentially shifted in the circumferential direction (see FIG. 12).

As in the case of the multiphase claw pole motor 1 of this embodiment, even when all of the stator 2 is formed of a magnetic molded body obtained by compressing magnetic powder, it is formed of alpha winding as in the above embodiment. By adopting the annular coil 4, the winding process can be simplified by allowing both ends 42 of the winding 41 to be drawn from the outside of the annular coil 4.

[Fourth Embodiment]
The multiphase claw pole motor 1 of the present embodiment includes a member that functions as a positioning means for positioning each of the plurality of outer yokes 50 at a predetermined position, for example, a semi-annular object 7 (see FIG. 18 and the like). The semi-annular object 7 is composed of a pair of cylindrical objects divided along a longitudinal section, arranged around the outer yoke 50, and the pair is combined to form an annular shape. The resin mold 19 (see FIG. 23) Form. The semi-annular object 7 is configured to sandwich the claw magnetic pole 30 positioned by the following inclusion 6 when a pair is combined (see FIG. 22 and the like). Further, the semi-annular object 7 of the present embodiment is also a component of a bearing support structure that supports the bearing 12.

In the inner periphery of the semi-annular object 7, for example, a plane or a groove for arranging approximately half of the plurality of outer yokes 50, for example, 12 pieces in a predetermined shape at a predetermined position in a fan shape or a semi-annular shape. An arrangement means is formed which is formed of a depression, a partition, or a combination thereof. For example, when the semi-annular object 7 is molded from a resin, the arrangement means can be formed by simultaneously molding it on the inner peripheral side. The disposing means is formed in a shape that comes into contact with the outer periphery and the end face (side surface) in the circumferential direction of each of the plurality of outer yokes 50. By arranging a plurality of outer yokes 50 on the inner periphery of the semi-annular object 7 and combining the pair of

semi-annular objects

7, 7, all the outer yokes 50 are placed at predetermined positions around the stator inner periphery 3. (See FIGS. 18, 19 and the like). An insert molded product including the outer yoke 50 as an insert may be used as the semi-annular product 7.

One or both of the butting surfaces 72, which are the circumferentially combined portions of the pair of semi-annular objects 7, are formed with a drawing groove 71 for drawing the winding 41 to the outside (see FIG. 18, FIG. 19, etc.). . The winding 41 passes through a gap 56 between the outer yoke 50 and the outer yoke 50 (see FIG. 3), and is further drawn out through a drawing groove 71 formed in the butting surface 72 of the semi-annular object 7. It is.

The semi-annular object 7 of the present embodiment is formed to have a size that accommodates the stator inner peripheral portion 3 in which two pairs of opposed claw magnetic poles 30 for one phase are overlapped for three phases. In addition, the semi-annular object 7 is formed so as to sandwich the stator inner peripheral portion 3 including the claw magnetic poles 30 in a state where three phases are superimposed in the vicinity of the center in a state where a pair is combined with each other. .

In addition, it cannot be overemphasized that the semi-annular thing 7 demonstrated here is only a suitable example of the member which functions as a positioning means which positions each of the some outer periphery yoke 50 in a predetermined position. As long as it can be exhibited, in addition to a member divided into two equal parts in the circumferential direction, a member divided into three equal parts, four equal parts, etc. can be adopted.

Further, the multiphase claw pole motor 1 of the present embodiment includes an inclusion 6 that functions as a positioning means for positioning the claw magnetic pole 30 in the axial direction (see FIG. 20 and the like). A configuration in which, for example, a cylindrical inclusion 6 is interposed between a pair of claw magnetic poles 30 that are opposed to each other and a magnetic attraction force is received by the inclusion 6 so that no extra pressure acts on the annular coil 4 or the like. It can be.

As described above, the specific configuration of the inclusion 6 is not particularly limited as long as it does not cause excessive pressure to act on the annular coil 4 or the like by receiving the magnetic attractive force, but at least a part of the claw magnetic pole 30 is not limited. The shape is located in the gap between the claw portions 31 and is positioned by contacting each of the claw magnetic poles 30 facing in the axial direction. For example, in this embodiment, the cylindrical inclusion 6 in which the claw part accommodation recessed part 61 in which each of the claw part 31 of the pair of claw magnetic poles 30 opposed to the claw part 31 is accommodated is formed along the circumferential direction is adopted. (See FIG. 20 and the like). Further, the inclusion 6 of the present embodiment is a non-magnetic and insulating resin molded product. In this case, the inclusion 6 may be an insert molded product including a metal or the like, or may be an insert molded product including the claw magnetic pole 30. In addition, the inclusion 6 which is an insert-molded product including the claw magnetic pole 30 inserted therein is insert-molded together with the α-winding annular coil 4 or is wound around the molded inclusion 6. It can be used when winding in a manner. The cylindrical inclusion 6 has an outer diameter that matches the size of the hollow portion of the annular coil 4. A pair of claw magnetic poles 30 are assembled so as to sandwich the inclusion 6 and the annular coil 4 to form a stator inner peripheral portion 3 for one phase (see FIG. 21).

Further, in the inclusion 6, an axial end face 62 exposed in the axial direction is formed in the portion between the adjacent claw receiving recesses 61 in the stator inner peripheral portion 3 for one phase (see FIG. 20, see FIG. When the stator inner peripheral portion 3 for one phase is overlapped in the axial direction for three phases, the adjacent inclusions 6 are in contact with each other via this axial end face 62. In the case where the inclusions 6 are in contact with each other as described above, for example, if the concaves and convexes are overlapped so as to match each other not shown, the claw magnetic poles 30 of different layers such that the mechanical angle is shifted by 15 °. It may be a structure for positioning.

The assembly of the multiphase claw pole motor 1 of the present embodiment including the semi-annular object 7 and the inclusion 6 as described above will be described (see FIG. 24 and the like).

(1) One of the paired claw magnetic poles 30 (for example, claw magnetic pole 30A) is prepared (see FIG. 24 (1)), and (2) the inclusion 6 is fitted to the claw magnetic pole 30 on the side where the claw portion 31 is present. (See FIG. 24 (2)). (3) Further, the annular coil 4 is fitted (see FIG. 24 (3)), and (4) the other of the pair of claw magnetic poles 30 is fitted to form the stator inner peripheral portion 3 for one phase ( (See FIGS. 20, 21, and 24 (4)). At this time, the annular coil 4 is in a state of being freely rotatable relative to the pair of claw magnetic poles 30 and the inclusions 6. (5) Three stator inner peripheral portions 3 for one phase are abutted by shifting by a predetermined angle in the circumferential direction to form a stator inner peripheral portion 3 for three phases (see FIG. 24 (5)).

A plurality of claw magnetic poles 30 are arranged at predetermined positions on the inner periphery of each pair of semi-annular objects 7 (see FIGS. 18 and 22), and the three-phase stator inner periphery 3 is sandwiched between these half-rings. Combine the ring 7. At this time, each claw magnetic pole 30 is positioned between the inclusions 6 and is sandwiched between the pair of semi-annular objects 7. Moreover, the outer periphery yoke 50 which makes the stator outer peripheral part 5 is arrange | positioned in the predetermined | prescribed position around the stator inner peripheral part 3, and the stator 2 is formed (refer FIG. 19 etc.).

By attaching the shaft 11, the bearing 12, the rotor core 13, the sensor magnet 15, the front bracket 16 and the rear bracket 17 to which the rotor core 13 and the permanent magnet 14 are attached to the stator 2 (see FIG. 22 etc.) The phase claw pole motor 1 is assembled (see FIGS. 7 and 23).

According to the multi-phase claw pole motor 1 including the semi-annular object 7 as in the above-described embodiment, the semi-annular object 7 in which each of the plurality of outer yokes 50 is arranged on the inner periphery of the stator inner peripheral part 3. By installing on the outer peripheral side, the plurality of outer yokes 50 can be positioned at a predetermined position at a time. For this reason, even if the number of parts of the outer yoke 50 is large, it is possible to prevent the assembly from becoming complicated.

The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, although not specifically mentioned in the above embodiment, the engaging portion 55 is formed on the surface of the protruding portion 50 a of the outer yoke 50 that contacts the outer periphery of the claw magnetic pole 30, and the outer periphery of the outer periphery of the claw magnetic pole 30 is formed. On the surface in contact with the yoke 50, an engaged portion 35 that is formed in a shape that bites in the inner circumferential direction toward the extending direction of the claw portion 31 and engages with the engaging portion 55 of the outer yoke 50 is formed. May be. Such a structure works as follows.

That is, when a magnetic attraction force acts on the pair of claw magnetic poles (powder cores) 30 facing each other as in the above-described embodiment, the magnetic attraction force is all in the radial direction and the circumferential direction. Although it cancels out at the circumference, it acts as it is without canceling out in the axial direction. In the multi-phase claw pole motor 1 of the present embodiment, the annular coil 4 is disposed between the claw magnetic poles 30 (see FIG. 14 and the like). It is not preferable. In this regard, as described above, the engaged portion 35 is formed on the outer peripheral surface of the claw magnetic pole 30, and these are engaged with the engaging portion 55 of the outer yoke 50, and the pair of claw magnetic poles 30 that are overlapped face to face with each other. By restricting the interval so that they do not approach each other more than a predetermined distance, the suction force can be supported by the outer yoke 50 without acting on the annular coil 4. In other words, the force acting on the annular coil 4 by causing the outer yoke 50 to function as a stopper that defines the minimum distance between the claw magnetic poles 30 to be slightly larger than the thickness of the annular coil 4. Can be limited.

The specific structure of the engaged portion 35 and the engaging portion 55 is not particularly limited as long as the claw magnetic poles 30 can be held at predetermined intervals by being engaged with each other. For example, the engaged portion 35 may have a tapered shape having a slope inclined so as to bite in the inner circumferential direction toward the extending direction of the claw portion 31, or shown in FIGS. 14 and 15. Such a stepped shape may be used.

Further, in the case of a structure in which the inclusion 6 is interposed between the pair of claw magnetic poles 30 that are overlapped with each other and the magnetic attraction force is received by the inclusion 6, By providing the engaging portion 55, the magnetic attractive force received by the inclusion 6 may be reduced by burdening the plurality of outer yokes 50 (see FIGS. 16, 17, etc.).

The present invention is suitable for application to a multiphase claw pole motor, various industrial machines such as an electric power steering using the motor as a driving source, various driving devices, and a vehicle equipped with these.

DESCRIPTION OF SYMBOLS 1 ... Multi-phase claw pole motor, 2 ... Stator, 3 ... Stator inner peripheral part, 4 ... Ring coil, 5 ... Stator outer peripheral part, 6 ... Inclusion (2nd positioning means), 7 ... Semi-annular thing (First positioning means) 10 ... rotor, 11 ... shaft, 12 ... bearing, 30 ... claw magnetic pole (magnetic molding), 31 ... claw part, 31a ... magnetic pole surface, 32 ... radial yoke part, 41 ... Winding, 42 ... Winding terminal, 50 ... Outer yoke, 61 ... Claw receiving recess, 71 ... Drawer groove (groove), 72 ... Butting surface

Claims

A multi-phase claw pole motor,
A plurality of claw magnetic poles comprising a plurality of claw portions extending in the axial direction and having a magnetic pole surface facing the rotor with a minute gap, and a radial yoke portion extending from the claw portion to the outer shape side. The claw poles of the claw magnetic poles adjacent to each other are alternately arranged in the circumferential direction, and the radial yoke parts of the claw magnetic poles adjacent to each other are axially opposed to each other in the axial direction. Claw magnetic poles that are stacked to form the inner periphery of the stator;
An annular coil disposed in each gap of the radial yoke portion of the adjacent claw magnetic pole;
A plurality of outer yokes arranged circumferentially on the outer side of the inner periphery of the stator to form the outer periphery of the stator; and
With
The claw magnetic pole is formed of a magnetic molded body obtained by electrically insulating and compressing the surface of the magnetic powder, and the outer yoke is formed of a soft magnetic laminate.
A multi-phase claw pole motor further comprising first positioning means for positioning each of the outer yokes at a predetermined position.
The multi-phase claw pole motor according to claim 1, further comprising second positioning means for positioning each of the claw magnetic poles at a predetermined position.
The second positioning means is an inclusion positioned in a claw-shaped gap of at least a part of the claw magnetic pole, and the inclusion is positioned by contacting each of the claw portions opposed in the axial direction. The multiphase claw pole motor according to claim 2, wherein
The multiphase claw pole motor according to claim 3, wherein the inclusion is non-magnetic and insulating.
The multi-phase claw pole motor according to claim 3, wherein the inclusion is an insert molded product in which the magnetic molded body is inserted.
The multi-phase claw pole motor according to claim 5, wherein the annular coil is a coil formed by alpha winding, and the inclusion is an insert molded product in which the annular coil is inserted together.
The multi-phase claw pole motor according to claim 5, wherein the annular coil is constituted by a winding wound around the insert molded product.
4. The multi-phase claw pole motor according to claim 3, wherein the inclusion has a structure for positioning the magnetic molded body of another layer in a state where adjacent inclusions are in contact with each other.
The first positioning means has a shape that contacts the outer periphery and circumferential end surfaces of the plurality of outer yokes to form a part of an annular shape, and the plurality of first positioning means are combined with each other. The multiphase claw pole motor according to any one of claims 2 to 8, wherein the multiphase claw pole motor has an annular structure.
The plurality of first positioning means are structured so as to sandwich the magnetic molded body positioned by the second positioning means in the vicinity of the center in a state of being combined with each other. The multiphase claw pole motor according to 9.
The plurality of first positioning means has a shape in which substantially half of the plurality of outer yokes are positioned and arranged in a semi-annular shape, and the first positioning means combined with a pair includes the second positioning means. The multiphase claw pole motor according to claim 10, wherein the magnetic molded body positioned by positioning means is sandwiched.
The multiphase claw pole according to claim 9, wherein a groove portion is formed at a circumferential combination portion of the first positioning means, and a coil lead wire of the annular coil is drawn out through the groove portion. motor.
10. The multiphase claw pole motor according to claim 9, wherein the first positioning means is a component of a bearing support structure that supports a bearing.
The surface of the outer periphery of the claw magnetic pole, which is in contact with the outer yoke, has a constricted shape such as a taper or a step so as to bite in the inner peripheral direction toward the extending direction of the claw portion. The multiphase claw pole motor according to any one of 1 to 13.